FILE - In this Saturday, June 28, 2014 file photo, Atlanta Braves pitcher Shae Simmons throws against the Philadelphia Phillies in the ninth inning of the first game of a baseball doubleheader in Philadelphia. The Mariners have made a pair of trades, landing left-handed starter Drew Smyly from the Tampa Bay Rays and right-hander reliever Shae Simmons from the Atlanta Braves, Wednesday, Jan. 11, 2017. (AP Photo/H. Rumph Jr)

FILE - In this Tuesday, Sept. 20, 2016 file photo, Tampa Bay Rays starter Drew Smyly pitches against the New York Yankees during the first inning of a baseball game in St. Petersburg, Fla. The Mariners have made a pair of trades, landing left-handed starter Drew Smyly from the Tampa Bay Rays and right-hander reliever Shae Simmons from the Atlanta Braves, Wednesday, Jan. 11, 2017. (AP Photo/Steve Nesius, File)

SEATTLE (AP) — Jerry Dipoto's 11th trade this offseason rounded out the Seattle Mariners roster with his top target.

"I've probably spent more time through the course of our offseason trying to acquire Drew Smyly than any other thing that we've done," the general manager said Wednesday.

Seattle made pair of deals on Wednesday that ultimately landed Smyly, a pitcher Dipoto thinks will fill out the Mariners starting rotation. Seattle also landed a potential key reliever, getting right-hander Shae Simmons from the Atlanta Braves.

The Mariners acquired outfielder Mallex Smith from Atlanta, then sent him to Tampa Bay along with infielder Carlos Vargas and left-hander Ryan Yarbrough for Smyly. Smith was also an offseason target for the Mariners but when Seattle acquired Jarrod Dyson from Kansas City last week, Smith instead became the conduit in helping to obtain Smyly.

"It became apparent to us over the last two or three days that we were able to access Drew Smyly by making the deal with Atlanta that tapped into Mallex Smith," Dipoto said. "So effectively these were two deals that were interlinked."

Smyly is the centerpiece of what Seattle was trying to accomplish as the Mariners seem to have rounded out a starting rotation that appeared to be a major question at the start of the year. The acquisitions of Smyly and Yovani Gallardo from Baltimore last week appear to have filled out a rotation where Felix Hernandez, Hisashi Iwakuma and James Paxton were the only certainties.

Smyly, 27, made 30 starts last season for Tampa Bay, throwing a career-high 175 1/3 innings and striking out 167. He was 7-12 with a 4.88 ERA, but starting pitching is one of Tampa Bay's strongest assets, and Rays senior vice president of baseball operations and general manager Erik Neander felt comfortable making the deal because of the depth the Rays have in that area.

Smyly was 15-15 with a 3.95 ERA in 49 starts for Tampa Bay after being acquired from Detroit in the 2014 trade deadline deal that sent David Price to the Tigers. He is arbitration eligible after winning $3.75 million in an arbitration hearing last season.

"He fits our ballpark particularly well. He's a pretty extreme fly-ball pitcher with the low walks, high strikeouts, who in our ballpark, with what we think is a greatly improved outfield defense fits us like a glove really," Dipoto said. "If as we expect he shows up and does his thing it should fit very well for us in this ballpark."

What Smith may be able to add was attractive to Neander, who said the trade was made to help position the Rays to be competitive in 2017. He stopped short of saying he expects Smith to make the team coming out of spring training.

"We need to get better," Neander said. "To do that, we need more competition" for jobs.

Simmons is also a key acquisition for Seattle, providing another power arm in the bullpen. Simmons, 26, made seven appearances last season while recovering from Tommy John surgery and threw just 6 2/3 big league innings. Before elbow issues, Simmons was 1-2 with a 2.91 ERA in 26 appearances during the 2014 season.

"He's had a strong history with striking (batters) out and (we're) really excited to plug him in," Dipoto said.

The cost for Seattle to complete to two deals meant giving up two of its top pitching prospects in Yarbrough and Luiz Gohara. Yarbrough, 25, was named the Southern League pitcher of the year after going 12-4 with a 2.95 ERA at Double-A Jackson last season. Gohara, 20, was 7-2 with a 1.81 ERA and 81 strikeouts in 13 starts at two Class A stops.

Seattle also sent lefty Thomas Burrows to Atlanta and designated right-hander Cody Martin for assignment to make room on its 40-man roster.